Avoid bearing currents
Instruction handbook bmaXX 5000
Document No.: 5.09021.19 Baumüller Nürnberg GmbH
144
of 346
7.10
Locking torque of the fixing screw:
7.10 Avoid bearing currents
Device Locking torque
Single axis unit BM5326, BM5327, BM5328 0.8 Nm
cable diameter 5 - 20 mm
shielding clamp width 24 mm
Double axis unit BM5323, BM5325 0.8 Nm
cable diameter 3 - 14 mm
shielding clamp width 17 mm
Single axis unit BM5334, BM5335,
BM537X, connection 2 x 16 mm²
1 Nm
cable diameter 5 - 28 mm
shielding clamp width 31 mm
Double axis unit BM5331, BM5332, BM5333
Single axis unit BM537X, connection 50 mm² 1.5 bis 1.8 Nm
cable diameter 20 - 35 mm
shielding clamp width 40 mm
NOTE
The pulsed output voltage of a converter causes additional motor bearing currents.
Bearing currents cause localized melting on ball race and rolling body as well as wear
of the lubricant. This leads to a reduced service life of the bearing.
Bearing currents depend on:
m Motor speed
m Switching frequency of the converter
m Grounding
Furthermore the height of the bearing currents depends on:
m the applied bearing voltage
m the dielectric characteristic of the bearing lubrication
NOTE
The reduction of bearing currents requires the consideration of the whole speed-
variable drive system and its installation!
Baumüller supports you with on-site measurements and with development and imple-
mentation of suitable preventative measures.
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